11211211120 has 40 divisors (see below), whose sum is σ = 26672261616. Its totient is φ = 4380192768.

The previous prime is 11211211111. The next prime is 11211211147. The reversal of 11211211120 is 2111211211.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 11211211120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1626097 + ... + 1632976.

Almost surely, 2^11211211120 is an apocalyptic number.

11211211120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211211120 is an abundant number, since it is smaller than the sum of its proper divisors (15461050496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11211211120 is a wasteful number, since it uses less digits than its factorization.

11211211120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3259129 (or 3259123 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11211211120 its reverse (2111211211), we get a palindrome (13322422331).

Subtracting from 11211211120 its reverse (2111211211), we obtain a palindrome (9099999909).

The spelling of 11211211120 in words is "eleven billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty".